Weird sound at acceleration?

[Ruddell]

This is hard to explain but I seem to have a odd sounding "flutter like high-ish pitched howl" coming from the passenger side when doing about medium throttle, and happens at around 2800rpm. I can make out the slight air sound the turbo should make through this sound but its difficult to hear it clearly. At about 70mph there is a steady resemblance of the sound except fainter, and goes away when you let off. I baby the Ty when driving it and dont get on it but its obvious that its not producing as much boost as it should. According to the stock gauge it shows approx. 8lbs at the most. Does anyone happen to recognize this descrption of a odd noise like this?

 

[MikeRenz]

Re: Weird sound at acceleration?

i would venture to say you have a tear in one of your hoses and it's leaking under boost. either the turbo to ic, or ic to tb hose...check though for small tears, especially near the clamps.

 

[Ruddell]

Re: Weird sound at acceleration?

Okay, I will have to order a new hose for that. As a matter of fact, I checked the one thats on there very closely and although I couldn't see any obvious cuts I did find some very small small slices, but dosn't appear to be punctured. Is that all it takes to leak?

 

[MikeRenz]

Re: Weird sound at acceleration?

Okay, I will have to order a new hose for that. As a matter of fact, I checked the one thats on there very closely and although I couldn't see any obvious cuts I did find some very small small slices, but dosn't appear to be punctured. Is that all it takes to leak?

any slice will expand under boost, be a weak spot for all the pressure, and tend to leak. Sometimes it won't look like there is a cut all the way through but it is.

 

[Ruddell]

Re: Weird sound at acceleration?

Thanks. Once the hose is replaced I will let ya know if that was the culprit.

Have a good one man.

 

[Ruddell]

Re: Weird sound at acceleration?

Well I fitted a heavy duty corregated with metal rad hose inplace of the stock turbo to IC hose, bought new torque clamps, and it still makes the noise. My IC to TB rubber is tight and intact. Honestly, the noise kind of sounds like the beggining of one of those Storm Sirens. Could it be something with the waste gate? My boost solenoid was by-passed when I got the truck. All vac lines have been replaced with Adam's kit.

 

[Norm]

Re: Weird sound at acceleration?

I was thinking base gasket at the turbo mount on the manifold. Hows that gasket look?

 

[Ruddell]

Re: Weird sound at acceleration?

From what is visible it looks good:

 

[Norm]

Re: Weird sound at acceleration?

Does it do it when in park, or only while driving it? Pop the hood and rev it up, see/hear if can narrow it down. If your loosing boost then it sounds like it is between the turbo to intake.

 

[bizkit]

Re: Weird sound at acceleration?

If your boost solenoid is bypassed then you are running base boost which is 8lbs. Might be that all you need is a new boost solenoid they are like $12 from GM just go to your dealer and ask for a boost solenoid for a '89 Turbo Trans Am. The sound might be just your turbo whistling, mine has a 'sweet spot' at part throttle where it whistles. I like it.

 

[Ruddell]

Re: Weird sound at acceleration?

Norm, if I sit in the truck and gradually rev it up the noise appears at 2800rpm every time. Reving from the engine compartment I cant hear a thing because of the noise of the motor. When driving sometimes the sound dosn't appear as loud, maybe its the sweet spot bizkit mentioned, the turbo whistleing. I didn't think anything of the noise originaly, but I wouldn't no any different. Dereks Typhoon dosn't make such a noise, just the psi noise from the turbo so thats what raised my concern.

bizkit, when I got the Ty the boost solenoid was plugged at both outlets with screws, with the power still plugged into it. There was a vac line going straight from the turbo to the wastegate. Who knows how long it was drivin for like this in Japan before it was parked, but although the vac lines are replaced you think the solenoid could now be faulty? Will have to go to GM and inquire about getting a new one.

 

[primemover]

Re: Weird sound at acceleration?

Dude my turbo sound changes every time I do something to my motor. I set my timing correct it changed the turbo sound. I tightened air inlet lines the turbo sound changed. I put new vac hoses the turbo sound changed. I have no idea what the turbo is "supposed" to sound like. I probably would not worry too much about it unless it just sounds totally different.

 

[43t_ftw]

Re: Weird sound at acceleration?

Ruddell took me for a ride a couple of days ago and its defiantly not the normal turbo noise, this is more of a howling sound, you can hear the normal turbo whistle as well but this other noise is much louder

 

[bizkit]

Re: Weird sound at acceleration?

Best figure out what the howling noise is before you fix the solenoid and run more boost. Starting to get into unfamiliar territory for me, but check for shaft play/bent fins etc. on the turbo.

 

[Matt]

Re: Weird sound at acceleration?

check the turbo fins and plastic crossover for cracks

 

[Ruddell]

Re: Weird sound at acceleration?

I have checked the fins several times for damage, there is no plastic missing from the crossover tube, blade spins smoothly, and zero back and fourth movement in the wheel. Unfamilier territory should be stamped on my forehead when trying to think of what this howling is from. I ordered the boost solenoid today though.

 

[Ruddell]

Re: Weird sound at acceleration?

The fan clutch appears to be working as it should. I did that paper clip and blowing through the vac line on the solenoid and it appeared to pass, your supposed to plug the vent nipple right? With power going to it its plugged, and with power removed you can blow through it. I ordered a new solenoid, will put it in any ways I geuss...

 

[silverblaz]

Re: Weird sound at acceleration?

Sadly my truck made a sound like that last year it was my turbo and the fins were rubbing the housing.... Probably not your problem but its not a good noise

 

[wheels]

Re: Weird sound at acceleration?

I have checked the fins several times for damage, there is no plastic missing from the crossover tube, blade spins smoothly, and zero back and fourth movement in the wheel. Unfamilier territory should be stamped on my forehead when trying to think of what this howling is from. I ordered the boost solenoid today though.

What about side to side play? A little play is ok, but too much and it will rub.

 

[Ruddell]

Re: Weird sound at acceleration?

I couldn't find any movement in the fins just by grabbing the centre of the fin axle with two fingers. I will try again when I take things apart to do my IC pump this weekend, and push and pull anyway I can and see if theres movement at all. Does it take alot of force for it to move if its going to?